Partial discharge detection device

Abstract

The utility model relates to the technical field of partial discharge detection, and discloses a partial discharge detection device, which comprises a shell, a circuit board and an ultrasonic sensor. Wherein the circuit board is arranged in the shell, a CPU, a transient ground voltage detection conditioning circuit, an ultrasonic signal conditioning circuit, an ultrahigh frequency signal conditioning circuit and a communication module are integrated on the circuit board, and the ultrasonic sensor is arranged in the shell and used for detecting ultrasonic signals generated by partial discharge. According to the utility model, various detection functions of the ultrasonic sensor, the transient ground voltage detection conditioning circuit, the ultrahigh frequency signal conditioning circuit and the like are integrated, ultrasonic signals, transient ground voltage signals and ultrahigh frequency signals generated by partial discharge can be detected at the same time, the accuracy and reliability of partial discharge detection are improved, the structure is simple, and the performance is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of partial discharge detection, and particularly to a partial discharge detection device. Background Art

[0002] Partial discharge is one of the important signs of insulation deterioration of power equipment. Timely and accurate detection of partial discharge is crucial for ensuring the safe and stable operation of the power system. At present, the functions of partial discharge detection devices on the market are relatively single, and it is difficult to meet the comprehensive detection requirements for different types of partial discharges. In addition, the structures of existing partial discharge detection devices are relatively complex and the structural stability is average. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a partial discharge detection device which can meet the detection requirements for different types of partial discharges, and has a simple structure and stable performance.

[0004] To achieve the above purpose, the utility model provides a partial discharge detection device, including:

[0005] A housing;

[0006] A circuit board, which is arranged inside the housing, and integrated with a CPU, a transient earth voltage detection and conditioning circuit, an ultrasonic signal conditioning circuit, a very high frequency signal conditioning circuit and a communication module on the circuit board;

[0007] An ultrasonic sensor, which is arranged inside the housing and used for detecting ultrasonic signals generated by partial discharge;

[0008] The ultrasonic signal conditioning circuit is used for filtering and amplifying the ultrasonic signals detected by the ultrasonic sensor. The transient earth voltage detection and conditioning circuit detects the transient earth voltage signals generated by partial discharge and performs conditioning and amplification. The very high frequency signal conditioning circuit is used for conditioning and amplifying the very high frequency signals generated by partial discharge. The CPU is used for receiving and processing the data transmitted from the transient earth voltage detection and conditioning circuit, the ultrasonic signal conditioning circuit and the very high frequency signal conditioning circuit, and transmitting the detection results to an external device through the communication module.

[0009] Preferably, the transient earth voltage detection and conditioning circuit includes a logarithmic amplifier and a first band-pass filter. The logarithmic amplifier is used for amplifying and conditioning the transient earth voltage signal, and the first band-pass filter is used for filtering the amplified transient earth voltage signal.

[0010] Preferably, the ultrasonic signal conditioning circuit includes a first signal amplifier, a second band-pass filter, and a first AD conversion circuit. The first signal amplifier is used to amplify the ultrasonic signal, the second band-pass filter is used to filter the amplified ultrasonic signal, and the AD conversion circuit is used to perform analog-to-digital conversion on the filtered ultrasonic signal.

[0011] Preferably, the UHF signal conditioning circuit includes a second signal amplifier, a third band-pass filter, a logarithmic detector, and a second AD converter. The second signal amplifier is used to amplify the UHF signal, the third band-pass filter is used to filter the UHF signal, the logarithmic detector is used to convert the amplified UHF signal into a low-frequency signal, and the second AD converter is used to perform analog-to-digital conversion on the low-frequency signal.

[0012] Preferably, it further includes a temperature and humidity sensor. The temperature and humidity sensor is arranged inside the housing, and a detection hole opposite to the temperature and humidity sensor is provided on the housing. The temperature and humidity sensor is electrically connected to the circuit board.

[0013] Preferably, it further includes a battery management module and a lithium battery. The battery management module is electrically connected to the circuit board. The lithium battery is arranged inside the housing and is used to supply power to the circuit board.

[0014] Preferably, the housing includes an upper shell and a lower shell, and the upper shell and the lower shell are arranged in an opposing manner.

[0015] Preferably, a sealing ring is arranged between the upper shell and the lower shell.

[0016] The beneficial effects of the present utility model are as follows: The present utility model integrates multiple detection functions such as an ultrasonic sensor, a transient earth voltage detection conditioning circuit, and a UHF signal conditioning circuit, and can simultaneously detect ultrasonic signals, transient earth voltage signals, and UHF signals generated by partial discharge, improving the accuracy and reliability of partial discharge detection; moreover, the device has a simple structure, a reasonable layout, and strong stability.

[0017] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0019] Figure 1 The internal structural schematic diagram of the partial discharge detection device according to an embodiment of the present utility model is shown;

[0020] Figure 2 The three-dimensional internal structure diagram of the partial discharge detection device according to an embodiment of the present utility model is shown;

[0021] Figure 3 The schematic circuit board structure diagram of the partial discharge detection device according to an embodiment of the present utility model is shown;

[0022] Figure 4 The three-dimensional circuit board structure diagram of the partial discharge detection device according to an embodiment of the present utility model is shown;

[0023] Figure 5 The circuit diagram of the partial discharge detection device according to an embodiment of the present utility model is shown;

[0024] Figure 6 The schematic structure diagram of the partial discharge detection device according to an embodiment of the present utility model is shown.

[0025] Description of the reference numerals

[0026] 1 housing, 11 upper housing, 12 lower housing;

[0027] 2 circuit board, 21 CPU, 22 transient earth voltage detection and conditioning circuit, 23 ultrasonic signal conditioning circuit, 24 UHF signal conditioning circuit, 25 communication module;

[0028] 3 ultrasonic sensor, 4 temperature and humidity sensor, 5 battery management module, 6 lithium battery. Specific embodiments

[0029] The following details the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and illustrating the present utility model, and are not used to limit the present utility model.

[0030] Please refer to Figures 1 - 5 , this embodiment discloses a partial discharge detection device, including a housing 1, a circuit board 2 and an ultrasonic sensor 3. Among them, the circuit board 2 is disposed inside the housing 1, and the circuit board 2 is integrated with a CPU 21, a transient earth voltage detection and conditioning circuit 22, an ultrasonic signal conditioning circuit 23, a UHF signal conditioning circuit 24 and a communication module 25. The ultrasonic sensor 3 is disposed inside the housing 1 and is used to detect the ultrasonic signal generated by partial discharge.

[0031] The ultrasonic signal conditioning circuit 23 is used to filter and amplify the ultrasonic signals detected by the ultrasonic sensor, improving the quality and stability of the signals; the transient ground voltage detection and conditioning circuit 22 detects the transient ground voltage signals generated by partial discharges and conditions and amplifies them, and the UHF signal conditioning circuit 24 is used to condition and amplify the UHF signals generated by partial discharges. The CPU 21 is used to receive and process the data transmitted from the transient ground voltage detection and conditioning circuit 22, the ultrasonic signal conditioning circuit 23, and the UHF signal conditioning circuit 24, and transmits the detection results to an external device through the communication module 25. This embodiment is equipped with the communication module 25, which can transmit the detection results to an external device in real time, realizing remote transmission and monitoring of data, and facilitating users to understand the partial discharge situation of the device at any time and anywhere.

[0032] In actual use, the partial discharge detection device of this embodiment is placed near the power equipment that needs to be detected for partial discharge. The ultrasonic sensor 3, the transient ground voltage detection and conditioning circuit 22, and the UHF signal conditioning circuit 24 respectively detect the ultrasonic signals, transient ground voltage signals, and UHF signals generated by partial discharges, transmit these signals to the corresponding conditioning circuits for processing, and transmit the data to the CPU 21. The CPU 21 receives the data from each sensor and conditioning circuit and performs analysis and processing.

[0033] This embodiment integrates various detection functions such as the ultrasonic sensor 3, the transient ground voltage detection and conditioning circuit 22, and the UHF signal conditioning circuit 24, and can simultaneously detect the ultrasonic signals, transient ground voltage signals, and UHF signals generated by partial discharges, improving the accuracy and reliability of partial discharge detection.

[0034] Please refer to Figure 3 , in this embodiment, the transient ground voltage detection and conditioning circuit 22 includes a logarithmic amplifier and a first band-pass filter. The logarithmic amplifier is used to amplify and condition the transient ground voltage signal, and the first band-pass filter is used to filter the amplified transient ground voltage signal.

[0035] Specifically, the transient ground voltage signal is induced by the induction metal plate into a high-frequency pulse signal. The high-frequency pulse signal is sent into the logarithmic amplifier. After the signal is amplified and shaped, it is sent into the first band-pass filter to retain the signals of 3 MHz to 100 MHz, and then sent to the high-speed IO port of the CPU 21 for acquisition. The CPU 21 calculates the intensity of the transient ground voltage signal according to the frequency change.

[0036] In this embodiment, the ultrasonic signal conditioning circuit 23 includes a first signal amplifier, a second band-pass filter, and a first AD conversion circuit. The first signal amplifier is used to amplify the ultrasonic signal, the second band-pass filter is used to filter the amplified ultrasonic signal, and the AD conversion circuit is used to perform analog-to-digital conversion on the filtered ultrasonic signal.

[0037] Specifically, the ultrasonic signal is converted into a weak current signal by the ultrasonic sensor 3, amplified by the first signal amplifier, then sent to the second band-pass filter to retain the 20KHz - 60kHz signal, and then sent to the first AD conversion circuit for analog-to-digital conversion and then enters the CPU 21 via the data bus.

[0038] In this embodiment, the UHF signal conditioning circuit 24 includes a second signal amplifier, a third band-pass filter, a logarithmic detector, and a second AD converter. The second signal amplifier is used to amplify the UHF signal, the third band-pass filter is used to filter the UHF signal, the logarithmic detector is used to convert the amplified UHF signal into a low-frequency signal, and the second AD converter is used to perform analog-to-digital conversion on the low-frequency signal.

[0039] Specifically, the UHF signal is coupled into the signal amplifier through the UHF antenna, filtered by the band-pass filter, and the filtered 300MHz - 3000MHz signal enters the logarithmic detector to convert the high-frequency signal into a 30MHz - 90MHz low-frequency signal. The low-frequency signal is sent to the 16-bit ADC circuit, and after AD conversion, it enters the CPU 21 via the data bus.

[0040] In this embodiment, it further includes a temperature and humidity sensor 4. The temperature and humidity sensor 4 is arranged inside the housing 1, and a detection hole opposite to the temperature and humidity sensor 4 is arranged on the housing 1. The temperature and humidity sensor 4 is electrically connected to the circuit board 2. The temperature and humidity sensor 4 senses the temperature and humidity of the switch cabinet and directly transmits them to the CPU 21 through the IIC bus. This embodiment is equipped with the temperature and humidity sensor 4, which can monitor the environmental temperature and humidity in real time, provide environmental parameter references for partial discharge detection, and help to more accurately judge the situation of partial discharge.

[0041] After receiving the UHF signal, ultrasonic signal, and transient earth voltage signal, the CPU 21 selects the corresponding adaptive filtering algorithm according to the temperature and humidity parameters based on the pre-recorded background noise, obtains the new characteristic values of the UHF, ultrasonic, and transient earth voltage signals, and outputs characteristic maps such as time-domain - frequency-domain maps and pulse - spectrum diagrams to management devices such as mobile phones and computers. The external device runs management analysis software and compares with the typical maps stored in the management software, which can effectively filter out interference maps and judge the type and intensity of partial discharge.

[0042] Preferably, it further includes a battery management module 5 and a lithium battery 6. The battery management module 5 is electrically connected to the circuit board 2, and the lithium battery 6 is arranged inside the housing 1 and used to supply power to the circuit board 2. The power management module 5 is responsible for managing the charging and discharging of the lithium battery 6 and provides a stable power supply for the entire device. Using the lithium battery 6 for power supply, it has a small volume, strong portability, and is convenient for partial discharge detection in different occasions.

[0043] Please refer to Figure 4 , the housing 1 includes an upper housing 11 and a lower housing 12, and the upper housing 11 and the lower housing 12 are arranged in an opposing manner. In addition, a sealing ring is provided between the upper housing 11 and the lower housing 12. The housing 1 protects each component inside the device, and at the same time has good waterproof, dustproof and shockproof performances, ensuring that the device can work normally in various harsh environments.

[0044] In summary, this embodiment integrates various detection functions such as the ultrasonic sensor 3, the transient earth voltage detection and conditioning circuit 22, and the UHF signal conditioning circuit 24, and can simultaneously detect the ultrasonic signal, the transient earth voltage signal and the UHF signal generated by partial discharge, improving the accuracy and reliability of partial discharge detection.

[0045] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0046] In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A partial discharge detection device, characterized in that: include: shell; A circuit board, the circuit board is arranged inside the housing, and the circuit board integrates a CPU, a transient voltage detection and conditioning circuit, an ultrasonic signal conditioning circuit, a UHF signal conditioning circuit, and a communication module; An ultrasonic sensor, the ultrasonic sensor is arranged inside the housing and is used to detect ultrasonic signals generated by partial discharge; The ultrasonic signal conditioning circuit is used to filter and amplify the ultrasonic signal detected by the ultrasonic sensor, the transient ground voltage detection conditioning circuit detects the transient ground voltage signal generated by partial discharge and conditions and amplifies it, the ultra-high frequency signal conditioning circuit is used to condition and amplify the ultra-high frequency signal generated by partial discharge, and the CPU is used to receive and process data transmitted from the transient ground voltage detection conditioning circuit, the ultrasonic signal conditioning circuit and the ultra-high frequency signal conditioning circuit, and transmit the detection results to an external device through the communication module.

2. The partial discharge detection device according to claim 1, characterized in that: The transient ground voltage detection and conditioning circuit includes a logarithmic amplifier and a first bandpass filter. The logarithmic amplifier is used to amplify and condition the transient ground voltage signal, and the first bandpass filter is used to filter the amplified transient ground voltage signal.

3. The partial discharge detection device according to claim 2, characterized in that: The ultrasonic signal conditioning circuit includes a first signal amplifier, a second bandpass filter and a first AD conversion circuit. The first signal amplifier is used to amplify the ultrasonic signal, the second bandpass filter is used to filter the amplified ultrasonic signal, and the AD conversion circuit is used to perform analog-to-digital conversion on the filtered ultrasonic signal.

4. The partial discharge detection device according to claim 3, characterized in that: The UHF signal conditioning circuit includes a second signal amplifier, a third bandpass filter, a logarithmic detector and a second AD converter, wherein the second signal amplifier is used to amplify the UHF signal, the third bandpass filter is used to filter the UHF signal, the logarithmic detector is used to convert the amplified UHF signal into a low-frequency signal, and the second AD converter is used to perform analog-to-digital conversion on the low-frequency signal.

5. The partial discharge detection device according to claim 1, characterized in that: It also includes a temperature and humidity sensor, which is arranged inside the shell, and the shell is provided with a detection hole opposite to the temperature and humidity sensor, and the temperature and humidity sensor is electrically connected to the circuit board.

6. The partial discharge detection device according to claim 1, characterized in that: It also includes a battery management module and a lithium battery. The battery management module is electrically connected to the circuit board. The lithium battery is arranged in the housing and is used to supply power to the circuit board.

7. The partial discharge detection device according to claim 1, characterized in that: The housing comprises an upper shell and a lower shell, and the upper shell is matched with the lower shell.

8. The partial discharge detection device according to claim 7, characterized in that: A sealing ring is arranged between the upper shell and the lower shell.

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